tools/viewer/ParticlesSlide.h

/*
* Copyright 2019 Google LLC
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/

#ifndef ParticlesSlide_DEFINED
#define ParticlesSlide_DEFINED

#include "Slide.h"

#include "SkPath.h"
#include "SkRandom.h"
#include "SkTArray.h"

class AnimTimer;
class SkParticleEffect;
class SkParticleEffectParams;

class ParticlesSlide : public Slide {
public:
    ParticlesSlide();

    // TODO: We need a way for primarily interactive slides to always be as large as the window
    SkISize getDimensions() const override { return SkISize::MakeEmpty(); }

    void load(SkScalar winWidth, SkScalar winHeight) override;
    void draw(SkCanvas* canvas) override;
    bool animate(const AnimTimer& timer) override;

    bool onMouse(SkScalar x, SkScalar y, sk_app::Window::InputState state,
                 uint32_t modifiers) override;

private:
    void loadEffects(const char* dirname);

    SkRandom fRandom;
    const AnimTimer* fTimer;
    SkPoint fPlayPosition;

    struct LoadedEffect {
        SkString fName;
        sk_sp<SkParticleEffectParams> fParams;
    };
    SkTArray<LoadedEffect> fLoaded;

    struct RunningEffect {
        SkPoint fPosition;
        SkString fName;
        sk_sp<SkParticleEffect> fEffect;
    };
    SkTArray<RunningEffect> fRunning;
};

#endif